- EMDB-44537: Human DNA polymerase theta helicase domain dimer bound to DNA in ... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-44537
タイトル
Human DNA polymerase theta helicase domain dimer bound to DNA in the microhomology aligning conformation
マップデータ
Map locally filtered by resolution
試料
複合体: Human DNA polymerase theta helicase domain bound to stem-loop DNA with microhomology in the 3' overhang
複合体: Human DNA polymerase theta helicase domain
タンパク質・ペプチド: DNA polymerase theta
複合体: Stem-loop DNA with microhomology in the 3' overhang
DNA: Stem-loop DNA with microhomology in the 3' overhang
キーワード
DNA repair / TMEJ / MMEJ / DNA binding protein
機能・相同性
機能・相同性情報
double-strand break repair via alternative nonhomologous end joining / HDR through MMEJ (alt-NHEJ) / single-stranded DNA helicase activity / replication fork processing / site of DNA damage / mitochondrial nucleoid / 5'-deoxyribose-5-phosphate lyase activity / somatic hypermutation of immunoglobulin genes / error-prone translesion synthesis / negative regulation of double-strand break repair via homologous recombination ...double-strand break repair via alternative nonhomologous end joining / HDR through MMEJ (alt-NHEJ) / single-stranded DNA helicase activity / replication fork processing / site of DNA damage / mitochondrial nucleoid / 5'-deoxyribose-5-phosphate lyase activity / somatic hypermutation of immunoglobulin genes / error-prone translesion synthesis / negative regulation of double-strand break repair via homologous recombination / RNA-directed DNA polymerase activity / DNA helicase activity / base-excision repair / protein homooligomerization / RNA-directed DNA polymerase / double-strand break repair / site of double-strand break / DNA helicase / damaged DNA binding / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA repair / DNA damage response / chromatin binding / magnesium ion binding / Golgi apparatus / ATP hydrolysis activity / nucleoplasm / ATP binding / identical protein binding / nucleus / cytosol 類似検索 - 分子機能
: / DNA_pol_Q helicase like region helical domain / DNA polymerase theta-like, helix-turn-helix domain / Helix-turn-helix domain / DNA polymerase A / DNA polymerase family A / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain ...: / DNA_pol_Q helicase like region helical domain / DNA polymerase theta-like, helix-turn-helix domain / Helix-turn-helix domain / DNA polymerase A / DNA polymerase family A / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain / DEAD/DEAH box helicase domain / DEAD/DEAH box helicase / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / Ribonuclease H superfamily / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
National Institutes of Health/National Cancer Institute (NIH/NCI)
F32CA288144
米国
National Institutes of Health/National Center for Research Resources (NIH/NCRR)
S10OD032467
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Human polymerase θ helicase positions DNA microhomologies for double-strand break repair. 著者: Christopher J Zerio / Yonghong Bai / Brian A Sosa-Alvarado / Timothy Guzi / Gabriel C Lander / 要旨: DNA double-strand breaks occur daily in all human cells and must be repaired with high fidelity to minimize genomic instability. Deficiencies in high-fidelity DNA repair by homologous recombination ...DNA double-strand breaks occur daily in all human cells and must be repaired with high fidelity to minimize genomic instability. Deficiencies in high-fidelity DNA repair by homologous recombination lead to dependence on DNA polymerase θ, which identifies DNA microhomologies in 3' single-stranded DNA overhangs and anneals them to initiate error-prone double-strand break repair. The resulting genomic instability is associated with numerous cancers, thereby making this polymerase an attractive therapeutic target. However, despite the biomedical importance of polymerase θ, the molecular details of how it initiates DNA break repair remain unclear. Here, we present cryo-electron microscopy structures of the polymerase θ helicase domain bound to microhomology-containing DNA, revealing DNA-induced rearrangements of the helicase that enable DNA repair. Our structures show that DNA-bound helicase dimers facilitate a microhomology search that positions 3' single-stranded DNA ends in proximity to align complementary bases and anneal DNA microhomology. We characterize the molecular determinants that enable the helicase domain of polymerase θ to identify and pair DNA microhomologies to initiate mutagenic DNA repair, thereby providing insight into potentially targetable interactions for therapeutic interventions.
全体 : Human DNA polymerase theta helicase domain bound to stem-loop DNA...
全体
名称: Human DNA polymerase theta helicase domain bound to stem-loop DNA with microhomology in the 3' overhang
要素
複合体: Human DNA polymerase theta helicase domain bound to stem-loop DNA with microhomology in the 3' overhang
複合体: Human DNA polymerase theta helicase domain
タンパク質・ペプチド: DNA polymerase theta
複合体: Stem-loop DNA with microhomology in the 3' overhang
DNA: Stem-loop DNA with microhomology in the 3' overhang
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超分子 #1: Human DNA polymerase theta helicase domain bound to stem-loop DNA...
超分子
名称: Human DNA polymerase theta helicase domain bound to stem-loop DNA with microhomology in the 3' overhang タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
由来(天然)
生物種: Homo sapiens (ヒト)
分子量
理論値: 20 KDa
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超分子 #2: Human DNA polymerase theta helicase domain
超分子
名称: Human DNA polymerase theta helicase domain / タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1
由来(天然)
生物種: Homo sapiens (ヒト)
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超分子 #3: Stem-loop DNA with microhomology in the 3' overhang
超分子
名称: Stem-loop DNA with microhomology in the 3' overhang / タイプ: complex / ID: 3 / 親要素: 1 / 含まれる分子: #2
由来(天然)
生物種: Homo sapiens (ヒト)
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分子 #1: DNA polymerase theta
分子
名称: DNA polymerase theta / タイプ: protein_or_peptide / ID: 1 / コピー数: 2 / 光学異性体: LEVO / EC番号: DNA helicase
モデル: Quantifoil R1.2/1.3 / 材質: COPPER / メッシュ: 300 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: HOLEY / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 30 sec. 詳細: Grids were glow discharged under vacuum for 30 s at 15 mA in a Pelco easiGlow 91000 Glow Discharge Cleaning System.
凍結
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 277 K / 装置: HOMEMADE PLUNGER 詳細: 3 microliters of sample was applied to the surface of the grid, blotted for 2 seconds after the liquid spot on the filter paper stopped spreading, and the grid was plunged into a liquid ...詳細: 3 microliters of sample was applied to the surface of the grid, blotted for 2 seconds after the liquid spot on the filter paper stopped spreading, and the grid was plunged into a liquid ethane bath cooled by liquid nitrogen..
詳細
We added 2X pre-annealed DNA to the protein, lowered the NaCl concentration to 100 mM, and purified the DNA-bound complex by SEC.